Solved

Direct Attached Storage, Raid 10 vs Raid 5 for Backup server.

Posted on 2009-04-06
1
424 Views
Last Modified: 2013-11-14
I understand raid 10 and raid 5, and I know quite a bit about their strength's and weaknesses in normal applications.  What I need assistance with is a special application of these drives.  

The situation is this:  We will have (14) 1TB Near Line SAS drives (7200 RPM drives with SAS connections for better throughput) http://www.seagate.com/docs/pdf/datasheet/disc/ds_barracuda_es_2.pdf

It will be for our backup server. So heavy writes of tiny delta files (1k or so) up to files in the hundred meg range.  It gets hit by several hundred servers around the same time at night 9pm or so all through the night.  The only time anything is read from it is when we need to recover a file, or when we start replicating the data to an offsite storage unit.

We have had issues before with the replication causing high read queues and never actually completing on our current setup (7 drives with sata throughput) which is why we are considering raid 10.  

In such a large write heavy situation is raid 10 reccomended ?  Or will the fact that we have 14 drives to spread the writes across make up for the difference if we go with Raid 5?  Is there even a performance boost to reads with raid 10 vs 5 ?

Thank you!
0
Comment
Question by:heliontech
1 Comment
 
LVL 30

Accepted Solution

by:
Duncan Meyers earned 500 total points
ID: 24082798
RAID 1/0 will always be faster than RAID 5 with a heavy write load as  you only have two write operations  at the discs for every host I/O rather than four. Given your description of the environment, I'd use a RAID 1/0 set with as many physical discs as possible to achieve the throughput you need. RAID 5 will give you greater storage efficiency, but write performance will be poor once the RAID controller write cache is saturated.
0

Featured Post

Save the day with this special offer from ATEN!

Save 30% on the CV211 using promo code EXPERTS30 now through April 30th. The ATEN CV211 connects a laptop directly to any server allowing you instant access to perform data maintenance and local operations, for quick troubleshooting, updating, service and repair.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

How to update Firmware and Bios in Dell Equalogic PS6000 Arrays and Hard Disks firmware update.
When we purchase storage, we typically are advertised storage of 500GB, 1TB, 2TB and so on. However, when you actually install it into your computer, your 500GB HDD will actually show up as 465GB. Why? It has to do with the way people and computers…
This video Micro Tutorial explains how to clone a hard drive using a commercial software product for Windows systems called Casper from Future Systems Solutions (FSS). Cloning makes an exact, complete copy of one hard disk drive (HDD) onto another d…
This Micro Tutorial will teach you how to reformat your flash drive. Sometimes your flash drive may have issues carrying files so this will completely restore it to manufacturing settings. Make sure to backup all files before reformatting. This w…

680 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question